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Kylie Jenner is often accused of copying sister Kim Kardashian - but it turns out her real twin is Kourtney .

The teen queen shared a FaceSwap of her and and Kris Jenner's eldest daughter today to celebrate her 37th birthday and the pair look eerily similar as they traded mugs, despite Kourtney being nearly two decades older.

With their brunette locks down and flawless matching make-up, you would never believe Kourtney was 18 when her younger sister was born.

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We know they're sisters, but this is scary!

Kylie admits Kourt is her favourite (Photo: Getty)

Despite having the largest age gap, Kylie admitted Kourtney is currently her "favourite" sister, writing alongside the video: "I love you Kourtney. You already know you are my favorite sister these days.."

She added: "Thank you for teaching me to see the glass half full through everything. Happy birthday ps. Mom in the background."

While Kourtney might have appreciate the message, we wonder what the rest of the Kardashian-Jenner sisters will think?

Kourtney might be Kylie's favourite, but it was Kim who she shared her birthday with. While the teenage beauty partied at the Coachella Music Festival this weekend, her elder sisters jetted to Iceland alongside Kanye West, Jonathan Cheban and Simon Huck where they've been taking in the spectacular scenery of the breath-taking country.

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Kourtney steps out on her birthday (Photo: Splash)

The mum-of-three looked in good spirits as she stepped out on Monday, rocking a laidback look of black leggings and burgundy bomber jacket, which she teamed with over-sized shades and a chocker.

The couple - who share three children together - split last June after nine years together, though in a sign the couple are getting Scott did get invited along to the most recent family ski-trip to Vail, Colorado.